/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2021 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "usart.h"
#include "gpio.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
//#define TX
#define RX

#define DHT11_DQ_OUT_LOW HAL_GPIO_WritePin(DHT11_GPIO_Port, DHT11_Pin, GPIO_PIN_RESET)
#define DHT11_DQ_OUT_HIGH HAL_GPIO_WritePin(DHT11_GPIO_Port, DHT11_Pin, GPIO_PIN_SET)
#define DHT11_DQ_IN HAL_GPIO_ReadPin(DHT11_GPIO_Port, DHT11_Pin)
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
uint8_t rx_flag = 0, tx_data[10] = "data: 0000";
uint16_t temperature;
uint16_t humidity;
/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
void delay_us(uint32_t delay);
/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
//temp hump
void DHT11_IO_IN(void) {
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.Pin = DHT11_Pin;
    GPIO_InitStructure.Mode = GPIO_MODE_INPUT;
    HAL_GPIO_Init(GPIOA,&GPIO_InitStructure);
}

void DHT11_IO_OUT(void) {
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.Pin = DHT11_Pin;
    GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_HIGH;
    HAL_GPIO_Init(GPIOA,&GPIO_InitStructure);
}

void DHT11_Rst(void) {
    DHT11_IO_OUT(); 	//
    DHT11_DQ_OUT_LOW; 	//
    HAL_Delay(20);    	//
    DHT11_DQ_OUT_HIGH; 	//
    delay_us(30);     	//
}

uint8_t DHT11_Check(void) {
    uint8_t retry=0;
    DHT11_IO_IN();
    while (DHT11_DQ_IN && retry<100) {
        retry++;
        delay_us(1);
    };
    if(retry>=100)return 1;
    else retry=0;
    while (!DHT11_DQ_IN&&retry<100) {
        retry++;
        delay_us(1);
    };
    if(retry>=100)return 1;
    return 0;	//???DHT11??0
}

uint8_t DHT11_Read_Bit(void) {
    uint8_t retry=0;
    while(DHT11_DQ_IN&&retry<100) {
        retry++;
        delay_us(1);
    }
    retry=0;
    while(!DHT11_DQ_IN&&retry<100) {
        retry++;
        delay_us(1);
    }
    delay_us(40);
    if(DHT11_DQ_IN)return 1;
    else return 0;
}

uint8_t DHT11_Read_Byte(void) {
    uint8_t i,dat;
    dat=0;
    for (i=0; i<8; i++) {
        dat<<=1;
        dat|=DHT11_Read_Bit();
    }
    return dat;
}

uint8_t DHT11_Read_Data(uint16_t *temp,uint16_t *humi) {
    uint8_t buf[5];
    uint8_t i;
    DHT11_Rst();
    if(DHT11_Check()==0) {
        for(i=0; i<5; i++) {
            buf[i]=DHT11_Read_Byte();
        }
        if((buf[0]+buf[1]+buf[2]+buf[3])==buf[4]) {
            *humi=(buf[0]<<8) + buf[1];
            *temp=(buf[2]<<8) + buf[3];
        }
    } else return 1;
    return 0;
}

uint8_t DHT11_Init(void) {
    DHT11_Rst();
    return DHT11_Check();
}
/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
    /* USER CODE BEGIN 1 */

    /* USER CODE END 1 */

    /* MCU Configuration--------------------------------------------------------*/

    /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
    HAL_Init();

    /* USER CODE BEGIN Init */

    /* USER CODE END Init */

    /* Configure the system clock */
    SystemClock_Config();

    /* USER CODE BEGIN SysInit */

    /* USER CODE END SysInit */

    /* Initialize all configured peripherals */
    MX_GPIO_Init();
    MX_USART1_UART_Init();
    MX_USART2_UART_Init();
    /* USER CODE BEGIN 2 */
#ifdef TX
    while(DHT11_Init()) {
        HAL_Delay(500);
    }
#endif
    __HAL_UART_ENABLE_IT(&huart1,UART_IT_RXNE);//open uart1 RXNE

    /* USER CODE END 2 */

    /* Infinite loop */
    /* USER CODE BEGIN WHILE */
    while (1)
    {
        /* USER CODE END WHILE */

        /* USER CODE BEGIN 3 */
#ifdef TX
//check  temp hump
        DHT11_Read_Data(&temperature,&humidity);
        tx_data[6] = temperature>>8;
        tx_data[7] = temperature&0xff;
        tx_data[8] = humidity>>8;
        tx_data[9] = humidity&0xff;
        HAL_UART_Transmit(&huart1, (uint8_t *)&tx_data, 10, 0xFFFF);
        HAL_Delay(2000);
#endif

#ifdef RX
        if(rx_flag)
        {
            rx_flag = 0;
            HAL_UART_Transmit(&huart2, (uint8_t *)&tx_data, 10, 0xFFFF);
            __HAL_UART_ENABLE_IT(&huart1,UART_IT_RXNE);//open uart1 RXNE
        }

#endif
        HAL_Delay(100);
        HAL_GPIO_TogglePin(LED_GPIO_Port, LED_Pin);
    }
    /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

    /** Initializes the RCC Oscillators according to the specified parameters
    * in the RCC_OscInitTypeDef structure.
    */
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
    RCC_OscInitStruct.HSEState = RCC_HSE_ON;
    RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
    RCC_OscInitStruct.HSIState = RCC_HSI_ON;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
    RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
    {
        Error_Handler();
    }
    /** Initializes the CPU, AHB and APB buses clocks
    */
    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                                  |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
    {
        Error_Handler();
    }
}

/* USER CODE BEGIN 4 */
void delay_us(uint32_t delay)
{
    for(uint32_t i=0; i<delay; i++)
    {
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();
        __NOP();

    }
}
/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
    /* USER CODE BEGIN Error_Handler_Debug */
    /* User can add his own implementation to report the HAL error return state */
    __disable_irq();
    while (1)
    {
    }
    /* USER CODE END Error_Handler_Debug */
}

#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
    /* USER CODE BEGIN 6 */
    /* User can add his own implementation to report the file name and line number,
       ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
    /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
